It wasn't. Numbers are not sentient and thus incapable of feeling fear.

Why did the chicken cross the road?

Because it was a necessary condition for the joke to exist.

A man walks into a bar....
He is an alcoholic and its destroying his family....

How many jews does it take to screw in a light bulb?
1

What did the farmer say when he lost his tractor?

Where's my tractor?

Your mum is so fat that when she dives into a pool she displaces a proportionately larger volume of water than people with less body mass.

Knock knock.

who's there?

it's the police, your family has died in a terrible accident.

A man walks into a bar. Unfortunately, he develops an epidural haematoma due to the blunt impact, and despite the best efforts of doctors, dies the next day.

He had a wife and two children, with a third on the way.

How many kangaroos does it take to fix a leaky water pipe?
None, a kangaroo has neither the intelligence nor dexterity to do any kind of plumbing work.

A duck walks into a bar. Animal control is promptly called and the duck is released in a nearby park.

What's black and white and red all over?
Nothing, as an object that is red all over does not have the capacity to also be black and white, unless we are taking shades of red under consideration, in which case you could take parts of the red qualities of the object in question and take them to the polar extremes of the visible spectrum, hence fulfilling the condition of being red, black and white.

There's an Irishman, a homosexual, and a Jew standing at a bar. What a fine example of an integrated community.

Your friend is so gay, he has consensual sex with other men. and enjoys it.

A: Knock knock!
B: Come in.

What did the homeless man get for christmas?
Nothing.

Three blind mice walk into a pub. They are all unaware of their surroundings, so to derive humor from it would be exploitative.

A duck walks into shop and says "Give me some Chapstick, put it on my bill!" But the cash register attendee doesn't speak English and cannot understand him. He does, however, question whether his God is punishing him because as all people know, Ducks cannot speak, however, this hallucination must be punishment for a horrid misdeed. The employee breaks down into tears and begins reciting prayer. The duck, slightly miffed, walks out, pondering why he'd need Chapstick anyway, since he has no lips.

How many Jews does it take to change a light bulb?
6. One to remove the light bulb, one to hold the ladder, one to stand ready to catch the light bulb in case it falls, a spotter to warn of possible hazards, someone to stand by the fuse box in case of electrocution and a health and safety officer to oversee the whole procedure and ensure that safety protocols are being correctly observed.